=+47. The Weibull distribution discussed in this section has a positive density function for all x . 0. In some situations, the smallest possible value of x will be some number  that exceeds zero. A shifted Weibull distribution, appropriate in such situations, has a density function for x .  obtained by replacing x with x 2 

in the earlier density function formula. The article

“Predictive Posterior Distributions from a Bayesian Version of a Slash Pine Yield Model” (Forest Science, 1996: 456–463) suggests that the values  5 1.3 cm,